I saw this on Boing Boing today and I knew I had seen this a few years ago. With a bit of work I was able to find the original site. The fishhighway domain is gone but thanks to Wayback Machine it still lives on. (Make sure you check out the images on Archive and not the other site that is just serving up the photos and raking in the ad bucks). Apparently it’s based on an old patent from 1877, you can see an image of it here. It’s a clever idea but even if you can clean the tubes with a magnitized cleaner it would still be a pain. But as aquariums go it does look awesome.